Convert Millicuries to Curies
Convert Millicuries (mCi) to Curies (Ci) instantly and accurately.
Conversion Formula
Ci = mCi × 0.001
About Millicuries
The millicurie (mCi) equals 3.7 × 10⁷ Bq = 37 MBq. The primary clinical nuclear medicine unit in the US: ¹⁸F-FDG PET doses are 8-15 mCi; ⁹⁹mTc cardiac stress tests use 25-35 mCi; ¹³¹I hyperthyroidism therapy uses 5-30 mCi. US pharmacopeia and NRC regulations specify doses in mCi. 1 mCi = 3.7 × 10⁷ Bq.
About Curies
The curie (Ci) equals exactly 3.7 × 10¹⁰ Bq = 37 GBq, originally defined as the activity of 1 g of ²²⁶Ra. Still widely used in the US: ⁶⁰Co teletherapy sources are 5000-15000 Ci; ¹³⁷Cs blood irradiators are 1000-40000 Ci; NRC source licences for industrial radiography cite Ci limits. 1 Ci = 3.7 × 10¹⁰ Bq.
Quick Reference Table
| Millicuries (mCi) | Curies (Ci) |
|---|---|
| 1 mCi | 0.001 Ci |
| 2 mCi | 0.002 Ci |
| 5 mCi | 0.005 Ci |
| 10 mCi | 0.01 Ci |
| 25 mCi | 0.025 Ci |
| 50 mCi | 0.05 Ci |
| 100 mCi | 0.1 Ci |